rlimits: split sys_setrlimit

Create do_setrlimit from sys_setrlimit and declare do_setrlimit
in the resource header. This is the first phase to have generic
do_prlimit which allows to be called from read, write and compat
rlimits code.

The new do_setrlimit also accepts a task pointer to change the limits
of. Currently, it cannot be other than current, but this will change
with locking later.

Also pass tsk->group_leader to security_task_setrlimit to check
whether current is allowed to change rlimits of the process and not
its arbitrary thread because it makes more sense given that rlimit are
per process and not per-thread.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/resource.h b/include/linux/resource.h
index f1e914eefeab..cf8dc96653ee 100644
--- a/include/linux/resource.h
+++ b/include/linux/resource.h
@@ -73,6 +73,8 @@ struct rlimit {
 struct task_struct;
 
 int getrusage(struct task_struct *p, int who, struct rusage __user *ru);
+int do_setrlimit(struct task_struct *tsk, unsigned int resource,
+                struct rlimit *new_rlim);
 
 #endif /* __KERNEL__ */